ci: prepare for v0.1.0 release

- Add Claudia logo to release body
- Add first release announcement and feature highlights
- Clean up test branch references in build workflows
- Update release body formatting for better presentation
- Fix reusable workflow errors by adding workflow_call triggers to build workflows

.github/workflows/build-linux.yml

@@ -1,9 +1,10 @@
 name: Build Linux
 
 on:
+  workflow_call:
   workflow_dispatch:
   push:
-    branches: [main, test-linux-workflow]
+    branches: [main]
 
 jobs:
   build: